import { useState } from 'react'

const noop = (event) => event.preventDefault()

function ViewGlyph({ kind }) {
  if (kind === 'two') {
    return (
      <svg viewBox="0 0 14 14" width="14" height="14" aria-hidden="true">
        <rect x="0" y="0" width="6" height="14" />
        <rect x="8" y="0" width="6" height="14" />
      </svg>
    )
  }
  if (kind === 'four') {
    return (
      <svg viewBox="0 0 14 14" width="14" height="14" aria-hidden="true">
        {[0, 8].map((x) =>
          [0, 8].map((y) => <rect key={`${x}-${y}`} x={x} y={y} width="6" height="6" />),
        )}
      </svg>
    )
  }
  return (
    <svg viewBox="0 0 14 14" width="14" height="14" aria-hidden="true">
      {[0, 5, 10].map((x) =>
        [0, 5, 10].map((y) => <rect key={`${x}-${y}`} x={x} y={y} width="4" height="4" />),
      )}
    </svg>
  )
}

const VIEWS = [
  { cols: 2, kind: 'two', label: '2 columns' },
  { cols: 3, kind: 'four', label: '3 columns' },
  { cols: 4, kind: 'nine', label: '4 columns' },
]

function Cell({ cell, projectName, index }) {
  const style = { aspectRatio: `928.5 / ${cell.h}` }
  if (cell.off) style.marginTop = `${cell.off / 2}px`
  return (
    <a
      className="cell"
      href="#"
      onClick={noop}
      style={style}
      aria-label={`${projectName} — visual ${index + 1}`}
    >
      {cell.type === 'img' ? (
        <img src={cell.src} alt={`${projectName} case visual ${index + 1}`} />
      ) : (
        <span className="hatch" aria-hidden="true" />
      )}
    </a>
  )
}

export default function ProjectSection({ project }) {
  const [cols, setCols] = useState(4)
  const [pressedCols, setPressedCols] = useState(4)
  const cells = project.rows.flat()

  return (
    <section className="project" id={project.id}>
      <div className="project-head">
        <h2 className="project-title">
          <a className="project-name" href="#" onClick={noop}>
            {project.name}
          </a>
          <span className="project-meta">
            , {project.tags.join(', ')}, {project.year}
          </span>
        </h2>
        <button className="plus" type="button" aria-label={`Expand ${project.name}`}>
          <svg viewBox="0 0 16 16" width="16" height="16" aria-hidden="true">
            <path d="M8 1v14M1 8h14" stroke="currentColor" strokeWidth="1.2" fill="none" />
          </svg>
        </button>
        <div className="views" role="group" aria-label={`${project.name} grid density`}>
          {VIEWS.map((view) => (
            <button
              key={view.cols}
              type="button"
              className={`view-btn${pressedCols === view.cols ? ' active' : ''}`}
              aria-pressed={pressedCols === view.cols}
              aria-label={view.label}
              onClick={() => {
                setCols(view.cols)
                setPressedCols(cols)
              }}
            >
              <ViewGlyph kind={view.kind} />
            </button>
          ))}
        </div>
      </div>
      <div className="grid" style={{ '--cols': cols }}>
        {cells.map((cell, i) => (
          <Cell key={i} cell={cell} projectName={project.name} index={i} />
        ))}
      </div>
    </section>
  )
}